Method for producing obliquely stretched film

A manufacturing method and a stretching film technology are applied in the manufacturing field of oblique stretched films and can solve the problems of uneven display and the like

Inactive Publication Date: 2017-12-01
KONICA MINOLTA INC
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Problems solved by technology

[0011] Thus, in the diagonally stretched film manufactured by the conventional manufacturing method, such as Figure 10 and Figure 11 As shown, rib-shaped residual stress T is generated obliquely with respect to the conveying direction of the film (direction from the stretching zone Z2 toward the heat-fixing zone Z3) and the widthwise direction. Therefore, in the OLED, as Figure 7 Striped display unevenness occurs in the oblique direction as shown

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  • Method for producing obliquely stretched film
  • Method for producing obliquely stretched film
  • Method for producing obliquely stretched film

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Embodiment Construction

[0035] One embodiment of the present invention will be as follows if described based on the drawings. In addition, in this specification, when a numerical range is shown as A-B, the value of the lower limit A and the upper limit B is included in this numerical range.

[0036] The method for producing a long diagonally stretched film according to this embodiment is to stretch a long raw film containing a thermoplastic resin in a diagonal direction with respect to the width direction and the long side direction to produce a long diagonal stretch film. A method for producing a long diagonally stretched film of a stretched film.

[0037]The orientation direction of the elongated obliquely stretched film, that is, the direction of the slow axis is a direction that forms an angle greater than 0° and less than 90° with respect to the broadside direction of the film in the film plane (in the plane perpendicular to the thickness direction) (It automatically becomes a direction which f...

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Abstract

This method for producing an obliquely stretched film comprises an oblique stretching step and a thermal fixing step. In the oblique stretching step, a film is transported while gripping both ends of the film in the width direction thereof with a pair of gripping tools and relatively advancing one gripping tool and relatively delaying the other gripping tool, to thereby stretch the film in an oblique direction with respect to the width direction. The thermal fixing step is a step for fixing the optical axis of the obliquely stretched film after the termination of the oblique stretching step. In the thermal fixing step, the obliquely stretched film after the termination of the oblique stretching step is widened. When the width of the obliquely stretched film after being obliquely stretched and before being widened is defined as L1 and the respective widths of a section widened toward the advanced side and a section widened toward the delayed side in the thermal fixing step with respect to a section corresponding to the width L1 of the obliquely stretched film before being widened are defined as L2 and L3, respectively, the relationship L3>L2>=0 mm is satisfied.

Description

technical field [0001] The present invention relates to a method for producing a diagonally stretched film in which a film is stretched obliquely with respect to a widthwise direction. Background technique [0002] Conventionally, a self-luminous display device such as an organic EL (Electro-Luminescence) display device called an OLED (Organic light-Emitting Diode) has attracted attention. In OLEDs, a reflector such as an aluminum plate is provided on the rear side of the display in order to improve light extraction efficiency. Therefore, external light incident on the display is reflected by the reflector, thereby reducing image contrast. [0003] Therefore, in order to improve the light-dark contrast by preventing reflection of external light, it is known to bond a stretched film and a polarizer to form a circular polarizing plate, and arrange the circular polarizing plate on the front side of a display. At this time, the above-mentioned circularly polarizing plate is for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/04
CPCB29C55/045B29C55/04B29C55/20
Inventor 畠山晋平
Owner KONICA MINOLTA INC
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